using System.Diagnostics;
 
try
{
}
catch (Exception ex)
{
  Debug.WriteLine("Exception: " + ex.Message);
}
Finally

using System.Diagnostics;

SelectedItem="{Binding TheProperty, PresentationTraceSources.TraceLevel=High}"

<system.diagnostics>
  <sources>
    <source name="System.ComponentModel.Composition" switchValue="Error">
      <listeners>
        <add name="fileListener" type="System.Diagnostics.TextWriterTraceListener" initializeData="Mef Composition.log" />
      </listeners>
    </source>
  </sources>
  <trace autoflush="true" indentsize="4" />
</system.diagnostics>

[DebuggerDisplay("Count = {count}")]
class MyHashtable
{
    public int count = 4;
}